<template>
  <div class="m-warning">
    <div class="warning-pie" ref="pie_Chart"></div>
  </div>
</template>

<script>
import * as echarts from "echarts";
import "echarts-gl";

import {mapState} from "vuex";

export default {
  props:{
    cdata:{
      type:Array,
      default(){
        return []
      }
    }
  },
  data() {
    return {
      chartInstance: null,
      numberLength:1,
      dataNum : [
        {
          name: "未处置",
          value: 0,
          code:'0',
          itemStyle: {
            opacity: 1,
            color: " #05b9c6",
          },
        },
        {
          name: "已处置",
          value:0,
          code:'1',
          itemStyle: {
            opacity: 1,
            color: "#3B8BFF",
          },
        },

      ]
    };
  },
  computed: {
    ...mapState(["theme"]),
  },
  methods: {
    /*
     *预警情况饼图
     */
    initChart() {
      this.chartInstance = echarts.init(this.$refs.pie_Chart, this.theme);
      let nums = this.dataNum.reduce((total, item) => {
        return (total += item.value);
      }, 0);
      let option = this.getPie3D(this.dataNum, 2,this);
      this.chartInstance.setOption(option);
      this.chartInstance.on('click',(param)=>{
        this.$emit('handlePieClick',param.seriesName)
      })
    },
    // 3D饼图的配置项，同echarjs的series
    getPie3D(pieData, internalDiameterRatio,param) {
      let _self=param;
      let series = [];
      let sumValue = 0;
      let startValue = 0;
      let endValue = 0;
      let legendData = [];
      let k =
          typeof internalDiameterRatio !== "undefined"
              ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
              : 1 / 3;

      // 3个饼图参数
      for (let i = 0; i < pieData.length; i++) {
        sumValue += pieData[i].value;

        let seriesItem = {
          name:
              typeof pieData[i].name === "undefined"
                  ? `series${i}`
                  : pieData[i].name,
          type: "surface",
          parametric: true,
          wireframe: {
            show: false,
          },
          label: {
            normal: {
              position: "outside",
              show: true,
            },
          },
          labelLine: {
            normal: {
              lineStyle: {
                color: "rgba(255, 255, 255, 0.3)",
              },
              smooth: 0.2,
              length: 50,
              length2: 100,
            },
          },
          pieData: pieData[i],
          pieStatus: {
            selected: false,
            hovered: false,
            k: k,
          },
        };
        if (typeof pieData[i].itemStyle != "undefined") {
          let itemStyle = {};
          typeof pieData[i].itemStyle.color != "undefined"
              ? (itemStyle.color = pieData[i].itemStyle.color)
              : null;
          typeof pieData[i].itemStyle.opacity != "undefined"
              ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
              : null;
          seriesItem.itemStyle = itemStyle;
        }
        series.push(seriesItem);
      }

      // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
      // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
      for (let i = 0; i < series.length; i++) {
        endValue = startValue + series[i].pieData.value;

        series[i].pieData.startRatio = startValue / sumValue;
        series[i].pieData.endRatio = endValue / sumValue;
        series[i].parametricEquation = this.getParametricEquation(
            series[i].pieData.startRatio,
            series[i].pieData.endRatio,
            false,
            false,
            k,
            series[i].pieData.value
        );
        startValue = endValue;
        legendData.push(series[i].name);
      }
      // 准备待返回的配置项，把准备好的 legendData、series 传入。
      let option = {
        tooltip: {
          formatter: (params) => {
            if (params.seriesName !== "mouseoutSeries") {
              return `${
                  params.seriesName
              }<br/><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${
                  params.color
              };"></span>${option.series[params.seriesIndex].pieData.value}`;
            }
          },
        },
        legend: {
          data: legendData,
          itemWidth: 12, //色标图宽
          itemHeight: 12, //色标图高
          orient: "horizontal", //水平显示
          bottom: 20,
          icon: "circle",
          itemGap: 15, //色标间隔
          textStyle: {
            color: "rgba(255,255,255,0.8)",
            fontSize: 12,
          },
          formatter: function (name) {
            let item = _self.dataNum.filter((item) => item.name == name)[0];
            return `${item.name} ${item.value}`;
          },
        },
        xAxis3D: {
          min: -1,
          max: 1,
        },
        yAxis3D: {
          min: -1,
          max: 1,
        },
        zAxis3D: {
          min: -1,
          max: 'dataMax',
        },
        grid3D: {
          show: false,
          boxHeight: 30,
          top: "-30",
          left: "0",
          bottom: "80%",
          environment: "auto",
          viewControl: {
            distance: 200, //远近
            alpha: 25, //饼图X轴旋转
            beta: 0, //饼图Y轴旋转
          },
        },
        series: series,
      }
      return option;
    },
    getParametricEquation(
        startRatio,
        endRatio,
        isSelected,
        isHovered,
        k,
        height
    ) {
      // 计算
      let midRatio = (startRatio + endRatio) / 2;
      let startRadian = startRatio * Math.PI * 2;
      let endRadian = endRatio * Math.PI * 2;
      let midRadian = midRatio * Math.PI * 2;

      if (startRatio === 0 && endRatio === 1) {
        isSelected = false;
      }

      // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
      k = typeof k !== "undefined" ? k : 1 / 3;

      // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
      let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
      let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;

      // 计算高亮效果的放大比例（未高亮，则比例为 1）
      let hoverRate = isHovered ? 1.05 : 1;

      // 返回曲面参数方程
      return {
        u: {
          min: -Math.PI,
          max: Math.PI * 3,
          step: Math.PI / 32,
        },

        v: {
          min: 0,
          max: Math.PI * 2,
          step: Math.PI / 20,
        },

        x: function (u, v) {
          if (u < startRadian) {
            return (
                offsetX +
                Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
            );
          }
          if (u > endRadian) {
            return (
                offsetX +
                Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
            );
          }
          return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
        },

        y: function (u, v) {
          if (u < startRadian) {
            return (
                offsetY +
                Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
            );
          }
          if (u > endRadian) {
            return (
                offsetY +
                Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
            );
          }
          return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
        },

        z: function (u, v) {
          if (u < -Math.PI * 0.5) {
            return Math.sin(u);
          }
          if (u > Math.PI * 2.5) {
            return Math.sin(u);
          }
          return Math.sin(v) > 0 ? 1 * height : -1;
        },
      };
    },
    getData(param){
      this.dataNum[0].value=param[0].count;
      this.dataNum[1].value=param[1].count;
      let option=this.getPie3D(this.dataNum, 2,this);
      this.chartInstance.setOption(option);
    }
  },
  mounted() {
    //加载完DOM渲染
    this.initChart();
    window.addEventListener("resize", () => {
      this.chartInstance.resize();
    });
  },
  destroyed() {
    window.removeEventListener("resize", () => {
      this.chartInstance.resize();
    });
  },
};
</script>

<style lang="scss" scoped>
.m-warning {
  width: 100%;
  height: 100%;
  overflow: hidden;

  .warning-pie {
    width: 100%;
    height: 100%;
  }
}
</style>
